rebarbative
Concise Oxford English Dictionary © 2008 Oxford University Press:
rebarbative /rɪˈbɑːbətɪv/
▶adjective formal unattractive and objectionable.
– origin C19: from Fr. rébarbatif, -ive, from OFr. se rebarber ‘face each other aggressively’ (lit. ‘beard to beard’), from barbe ‘beard’.
'rebarbative' also found in these Oxford entries:

